Quote:
Originally Posted by Atmos
Steve is correct, light can be changed but it cannot have its speed changed, although this does get complicated to explain when referring to refraction which is generally described as being the "slowing down of light within a material".
The author of this essay appears to be associating newtonian mechanics with photons, these two do not play well together.
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Maybe i'm wrong but I though 'C' was the speed of light in a vacuum. 'C' can slow down to 'C' - delta in other mediums, glass, water etc. In this case in that medium 'C' - delta would be the fastest possible speed.
In this case since light bending around the Sun would be very close to the Sun then since close to the Sun it is not a very good vacuum then light may slow down. Would this effect have to be taken into account in the calculations?